There won't be an answer to this question for another hundred years or so, as the current President, Barack Obama, is number 44.
LBj became president from (63-69) And his vice president took office from (65-69)
Surely- there is no upper age limit on the president and many people are healthy, vigorous and mentally alert at 65.
65
57-65
President of the US.
George W. Bush was 55 when sworn into office as President of the US. By comparison, his dad, George H.W. Bush, was 65 when sworn into the office as President of the US.
Joe Biden is Vice-President of the US and therefore President of the US Senate.
65
Buchanan was 65 when he was elected in 1856.
65
1861-65.
65 liters = 17.17 US gallons = 14.30 imperial gallons